关键词: 碳排放, 碳吸收, 碳收支, 西部地区, 气候变化

Abstract: With the rapid development of agriculture in western China, influences of carbon (C) emissions on corresponding ecological region are elevated. Therefore, it is crucial to assess the C balance on crop production in Western China for seeking low-carbon emission agriculture development strategies in this region. Based on agriculture related statistical data from 12 provinces in Western China during 1997-2012, this study evaluated the changes in quantity of C emission and fixation of crop production in those regions. The results indicated that the amounts of C emission and fixation of crop production system of each province in Western China increased with the year. The annual average increase was 3.7×106 t CO2-eq and 41.4×106 t CO2-eq for C emission and fixation, respectively. In addition, the average rate for C emission and fixation ranges from 51.7×104~3 314.7×104 t CO2-eq and 524.7×104~28 715.1×104 t CO2-eq, respectively. Among C emission inventories, chemical fertilizer application was the largest component occupied 45.7% of the total emission averagely, followed by fuel consumption of farming diesel and irrigation. Generally, the C balance of crop production in western China was surplus in fixation, but still observed variations varied greatly among provinces.

Key words: carbon emission, carbon fixation, carbon balance, Western China, climate change